Method for transmitting/receiving information using WUR

1. A first communication node in a wireless local area network (LAN) system, the first communication node comprising:

a processor;

a memory storing one or more instructions executable by the processor;

a first transceiver operating based on the one or more instructions; and

a second transceiver operating based on the one or more instructions,

wherein the one or more instructions are executed to:

transmit, to a second communication node, a request frame by using the first transceiver, the request frame including an information element indicating one or more channels supported by the second transceiver; and

receive, from the second communication node by using the first transceiver, a response frame including an information element indicating a first channel on which a wake-up frame is transmitted,

wherein the first channel indicated by the response frame is one of the one or more channels supported by the second transceiver,

wherein an operation bandwidth of the first transceiver is wider than an operation bandwidth of the second transceiver, and

wherein in a low-power mode, the first transceiver operates in an off-state, no power or minimum power is supplied to the first transceiver operating in the off-state, the second transceiver operates in an on-state, power is supplied to the second transceiver operating in the on-state, the second transceiver is used to support the low-power mode, and the second transceiver operating in the on-state receives a wake-up radio (WUR) frame in the low-power mode.

2. The first communication node according to claim 1 , wherein the one or more instructions are further executed to:

perform a monitoring operation using the second transceiver within a time window; and

transmit a first wake-up frame using the second transceiver when a second wake-up frame of a second communication node is not received by the monitoring operation.

3. The first communication node according to claim 2 , wherein the time window is configured through negotiation between the first communication node and the second communication node.

4. The first communication node according to claim 1 , wherein the one or more instructions are further executed to:

perform a monitoring operation using the second transceiver within a time window; and

transmit a data frame using the first transceiver without transmitting a first wake-up frame of the first communication node when a second wake-up frame of a second communication node is received by the monitoring operation.

5. The first communication node according to claim 4 , wherein when the second wake-up frame is a valid wake-up frame, the transmission of the first wake-up frame is omitted, and

wherein the valid wake-up frame is a wake-up frame for waking up a third communication node which is a destination of receiving the data frame.

6. The first communication node according to claim 5 , wherein a criterion for determining the valid wake-up frame is a reception strength of the second wake-up frame.

7. The first communication node according to claim 1 , wherein the one or more instructions are further executed to:

perform a monitoring operation using the second transceiver within a time window; and

transmit a first wake-up frame using the second transceiver to wake up a third communication node when a second wake-up frame of a second communication node received by the monitoring operation is not a valid wake-up frame for waking up the third communication node.

8. The first communication node according to claim 1 , wherein the one or more instructions are further executed to perform a monitoring operation on the first channel using the second transceiver to receive the wake-up frame.

9. The first communication node according to claim 1 , wherein the wake-up frame includes intelligent transportation system (ITS) information.

10. The first communication node according to claim 1 , wherein the wake-up frame includes a legacy preamble and a payload, a bandwidth over which the legacy preamble is transmitted is 20 MHz, and a bandwidth over which the payload is transmitted is less than 20 MHz.

11. The first communication node according to claim 1 , wherein the one or more instructions are further executed to:

generate the wake-up frame including state of charge (SoC) level information;

transmit the wake-up frame to a second communication node by using the second transceiver; and

transmit a data frame to the second communication node by using the first transceiver.

12. The first communication node according to claim 11 , wherein the data frame is transmitted when a poll frame indicating that the second communication node operates in a wake-up state is received.

13. The first communication node according to claim 12 , wherein the poll frame indicates that a vehicle in which the second communication node is located operates in a sleep state or wake-up state.

14. The first communication node according to claim 1 , wherein the one or more instructions are further executed to:

receive the wake-up frame from a second communication node through the second transceiver;

compare an SoC level indicated by the wake-up frame with a battery charge level of a vehicle in which the first communication node is located; and

when the battery charge level is below the SoC level, operate the first transceiver in the on-state.

15. The first communication node according to claim 14 , wherein the one or more instructions are further executed to transmit a poll frame indicating that the first transceiver operates in the on-state to the second communication node.

16. The first communication node according to claim 14 , wherein when the battery charge level exceeds the SoC level, the first transceiver maintains the off-state.